Extrusion & Post
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Delamination of PVA blended with incompatible resin
Problem Phenomenon
PVA blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
Cause Analysis
PVA and polar resin have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
Solution
1) Use PVA grafted compatibilizer PVA-g-MAH 2-5wt%; 2) Add epoxy-type compatibilizer 1-2wt%; 3) PVA addition <10wt% to keep the other resin as continuous phase; 4) Twin-screw high-shear blending to disperse PVA <0.3μm
Key Takeaway
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface to solve
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